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FORT EDWARD, N.Y. (NEWS10) – A man accused of murdering his mother, step-dad, and step-brother was found guilty on all counts on Tuesday.

It’s the second guilty verdict in the 2011 murder case.

On Tuesday, the special prosecutor says letters 29-year-old Matthew Slocum wrote from jail to his then girlfriend apologizing for doing “something terrible” was a main piece of evidence in the case.

People in the courtroom cheered after the verdict, not for the victory but for a bittersweet taste of justice.

For the second time, a jury convicted Slocum of murdering his own mother Lisa Harrington, stepfather Dan Harrington, and stepbrother Josh O’Brien and then lit the family’s White Creek home on fire to cover the evidence.

“You just want to jump out of your chair you know he finally got what he deserved. It’s just overwhelming. It’s a sweet sorrow I mean you know,” John Harrington, brother of Dan Harrington, said.

John says the quest for justice for his brother Dan’s murder has been hell. In 2015, an appellate court overturned Slocum’s original 2012 triple murder conviction stating that Slocum invoked his right to an attorney and should not have been questioned by police.

“Fate lies in someone else’s hands and what happens you know if he’s acquitted. That’s a whole new drama our family didn’t need and we’re just happy.”

“I feel vindicated. I feel as though that justice finally is done. Put him away and let him pay for his crime. Let us put him in the rear view mirror. Let us get back to our lives and go on,” Ray Harrington, father of Dan Harrington, said.

Ray is trying to move forward and his son forever on his mind.

“My thoughts never leave Dan, Lisa, and Josh. Every day.”

“It’s been 2,192 days waiting for this verdict Dan, Lisa and Josh we got you justice. Thank you,” Diana Harrington, mother of Dan Harrington, said.

Slocum now faces up to life in prison.

The prosecutor says he will ask for a term close to 88 years to life when Slocum is sentenced next month.